Cheeseburger Cream Puffs

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Puffs:

1/2 cup unsalted butter, at room temperature

1/2 teaspoon kosher salt

1 cup water

1 cup all-purpose flour

4 large eggs, at room temperature, plus 1 more egg

1/2 to 1 cup shredded Gruyere

2 tablespoons white sesame seeds

Cheese Mousse:

8 ounces cream cheese, at room temperature

One 6-ounce block processed American cheese, such as Velveeta, cubed and at room temperature

1/2 teaspoon paprika

1/2 teaspoon kosher salt

1/4 teaspoon ground white pepper

1/2 to 1 tablespoon heavy cream

Burger Patties:

1 pound 80/20 ground beef

Kosher salt and freshly ground black pepper

1 tablespoon unsalted butter

1 small yellow onion, thinly sliced

4 tablespoons ketchup

3 tablespoons mayonnaise

2 tablespoons sweet relish

Bacon strips, cooked, for serving, optional

1 head little gem lettuce, for serving

6 cornichons, halved, for serving